Skip to main content
New! Super-Kamiokande JSON Notices and Schema v4.5.0. See news and announcements

GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

672 results found.

  1. GRB 251219A: GECAM-B detection of a possible magnetar X-ray burst from SGR 1830-0645
  2. GRB 251129A/EP251129a : SVOM/ECLAIRs refined analysis
  3. GRB 251013C: MarSEC, optical afterglow photometry
  4. GRB 250823A: Swift detection of a burst
  5. GRB 250815A: Fermi GBM Final Localization
  6. The EP-WXT trigger 01709198251 is likely a flaring star
  7. Swift detection of the Soft Gamma Repeater PSR J1647-4552
  8. Fermi Gamma-ray Burst Monitor trigger 772838080/250628885 is not a GRB
  9. GRB 250621B: SVOM/GRM detection of a possible magnetar X-ray burst
  10. Fermi GRB 250509A: Global MASTER-Net observations report
  11. GRB 250430A: Konus-Wind detection and joint Konus-Wind+Swift-BAT spectral analysis
  12. GECAM-A detection of a bright burst from SGR 1E1841-045
  13. Konus-Wind detection of a bright burst from SGR 1E1841-045 on 2025 January 23
  14. IPN triangulation of a bright burst from SGR 1E1841-045
  15. GRB 250116A: GECAM-B detection of a long burst
  16. EP241217a: Gemini-North spectroscopic redshift z = 4.59
  17. Fermi Gamma-ray Burst Monitor trigger 755277791/241207641 is not a GRB
  18. SVOM/GRM observation of GRB 241126B or a short burst from magnetar
  19. SVOM/GRM detection of a short burst from SGR 1830
  20. GECAM detection of a short burst from SGR 1830
  21. SVOM/GRM detection of a short burst from SGR 1E1841-045
  22. GRB 241026A: LBT redshift confirmation
  23. SVOM/GRM detection of a burst from SGR Swift J1818.0-1607
  24. Insight-HXMT ToO observations of X-ray bursts from SGR 1E 1841-045 / Kes 73
  25. GRB 240914A : An intermediate duration GRB located on-board by SVOM/ECLAIRs.
  26. SGR 1E 1841-045 / Kes 73: SVOM/GRM observation
  27. SGR 1E 1841-045 / Kes 73 (Trigger 1249878): Osservatorio Atronomico Nastro Verde optical upper limit
  28. SGR 1E 1841-045 / Kes 73 (Trigger 1249653) - Osservatorio Astronomico Nastro Verde upper limit
  29. SGR 1E 1841-045 / Kes 73: Leavitt Observatory optical upper limit
  30. SGR 1E 1841-045 / Kes 73: Montarrenti Observatory optical upper limits
  31. GECAM-B observation of a short burst from SGR 1E 1841-045 / Kes 73
  32. Fermi-GBM Observations of the reactivation of SGR 1E 1841-045 / Kes 73
  33. Trigger 1249878: Swift detection of another burst from SGR 1E 1841-045 / Kes 73
  34. Trigger 1249653: Swift detection of SGR 1E 1841-045 / Kes 73
  35. Fermi trigger No 745871958: Global MASTER-Net observations report
  36. Konus-Wind detection of GRB 240315C (possible counterpart of EP240315a)
  37. X-ray transient EP240315a: orphan FXT?
  38. Einstein Probe detected of a fast X-ray transient EP240315a
  39. IPN triangulation of GRB 240112A (long)
  40. GRB 240112A: GECAM detection of a burst
  41. GRB 231115A: GBM/Fermi Observations of a probable Giant Flare of Magnetar
  42. GECAM-B observation of a short burst from SGR J1555-5402
  43. SGRJ1555-5402: Swift/BAT-GUANO arcminute localization of a SGR flare
  44. SGR 1806-20: Correction to GCN 33494
  45. INTEGRAL detection of a burst from SGR 1806-200
  46. VZLUSAT-2 detection of SGR 1806-20
  47. Trigger 1159327: Swift detection of SGR1806-20
  48. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 December 13
  49. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 November 9
  50. Fermi-GBM Observations of High Bursting Activity from SGR J1935+2154
  51. SGR 1935+2154: AstroSat CZTI Detections
  52. Fermi Gamma-ray Burst Monitor detections of SGR 1935+2154
  53. GRB 221023A: Fermi-LAT detection
  54. SGR 1935+21542: VZLUSAT-2 and GRBAlpha joint detection
  55. AGILE detection of a burst from SGR J1935+2154 reported by VZLUSAT-2
  56. SGR 1935+2154: Bursting activity detected by VZLUSAT-2
  57. AGILE detection of the 2022 October 17 burst from SGR J1935+2154 reported by Konus-Wind
  58. SGR 1935+2154: Detection by GRBAlpha
  59. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 October 17
  60. AGILE detection of short X-ray flaring activity contemporary to SGR J1935+2154 reported bursts
  61. Konus-Wind detection of a short burst coincident with a bright radio burst from SGR 1935+2154
  62. Konus-Wind observation of the recent SGR 1935+2154 activity
  63. Fermi Gamma-ray Burst Monitor detections of SGR 1935+2154
  64. Fermi Gamma-ray Burst Monitor continues to detect SGR 1935+2154
  65. Fermi-GBM Observations of High Bursting Activity from SGR J1935+2154
  66. INTEGRAL shows increasing activity in SGR J1935+2154
  67. INTEGRAL detection of a burst from SGR J1935+2154
  68. INTEGRAL detection of a burst from SGR J1935+2154
  69. Swift J1913.1+1946: Optical photometry
  70. Fermi GBM trigger 686350260/221001869 is not a GRB
  71. Ultra-long GRB 220525B: Konus-Wind and Fermi-GBM detection
  72. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on June 16
  73. Trigger 1108538: Swift detection of a burst from SGR J1935+2154
  74. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 May 25
  75. GRB 220211A: redshift lower limit estimating
  76. Fermi GBM trigger 666393834/220212892 is not a GRB
  77. GECAM observations of a series of bursts from SGR J1935+2154
  78. AGILE observations of a bright burst from SGR 1935+2154
  79. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on January 20
  80. IPN triangulation of a bright burst from SGR 1935+2154
  81. Konus-Wind observation of the recent SGR 1935+2154 activity
  82. GECAM observations of a series of bursts from SGR J1935+2154
  83. GECAM observations of a series of bursts from SGR J1935+2154
  84. Fermi-GBM Observations of Recent Bursting Activity from SGR J1935+2154
  85. AGILE observations of a burst from SGR 1935+2154
  86. GECAM observations of a series of bursts from SGR J1935+2154
  87. Fermi Gamma-ray Burst Monitor trigger 220111325/663580106 is not a GRB
  88. GECAM observations of a series of bursts from SGR J1935+2154
  89. GECAM observation of a burst from SGR J1555.2-5402
  90. GECAM detection of a short burst from SGR 1935+2154
  91. GECAM observations of a series of bursts from SGR J1935+2154
  92. GRB 211229A: GECAM detection
  93. Konus-Wind detection of the intermediate flare from SGR 1935+2154
  94. AGILE observations of a bright burst from SGR 1935+2154
  95. GECAM detection of a short burst probably from SGR J1555.2-5402
  96. Fermi Gamma-ray Burst Monitor trigger 211008665/655401471 is not a GRB
  97. GECAM observation of a burst from SGR J1555.2-5402
  98. SGR 1935+2154: Swift/BAT-GUANO detection and arcminute localization
  99. GECAM observations of a series of bursts from SGR J1935+2154 (2021-09-15T14 to 2021-09-23T14)
  100. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 September 22

Advanced

Download all Circulars as a .tar.gz archive:
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov